Custom & Practice
Custom, also referred to as state practice, is a major source of international law. To learn about state practice, you need to consult the sources that explain how a particular nation has acted in the past. Discussion of U.S. practice is found in the Digest of United States Practice in International Law, prepared by the Department of State.
This set compiles excerpts from treaties, decisions, diplomatic correspondence, and other documents reflecting the U.S. position on major issues of international law and includes explanatory commentary. A really handy feature are the links to the full text of documents excerpted in the digest.
You can also find more documentation of U.S. practice in Foreign Relations of the United States (1861–date). There is a considerable time lag between the original (often confidential) issuance of documents and their publication in this series. All of these volumes are also available in HeinOnline’s Foreign Relations of the United States collection.
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